A Survey of 50 Retail Stores Revealed That the Average

Multiple Choice

A survey of 50 retail stores revealed that the average price of a microwave was $375 with a sample standard deviation of $20. Assuming the population is normally distributed,what is the 99% confidence interval to estimate the true cost of the microwave?

A) $367.42 to $382.58
B) $315.00 to $415.00
C) $323.40 to $426.60
D) $335.82 to $414.28